RE: [cobalt-users] Backups NOT using a backup server such as Legato

["Edward R. Milstein" <eddie@xxxxxxxxxxx>]

In UNIX or Lynx, a program can open a file, write a byte, seek some
distance (1 meg), write another byte and close the file..

The result is a file that shows 1meg plus 1 byte in ls or programs like
that but in reality have a hole in the file..  In other words, the file
consists of 2 pages on disk, NOT 1 meg of pages..

Programs like dump do the right thing when backing them up.  Programs
like tar read the entire 1 meg file.  When reading from a holey file,
the holes appears as consecutive zeros to the reader.  A number of
programs create holey files such as DBM and others..  Filling in the
holes on a restore can cause strange problems for the programs that are
not expecting such.

I hope this answers your question below,

Thanks,

-ed-

> -----Original Message-----
> From: cobalt-users-admin@xxxxxxxxxxxxxxx [mailto:cobalt-users-
> admin@xxxxxxxxxxxxxxx] On Behalf Of Menno M Jansz
> Sent: Tuesday, April 16, 2002 5:18 PM
> To: cobalt-users@xxxxxxxxxxxxxxx
> Subject: Re: [cobalt-users] Backups NOT using a backup server such as
> Legato
> 
> 
> You could use Daniel's
http://www.neuhaus-internet.de/cobalt/raqbackup/
> 
> But it does make use of tar.
> 
> >I don't want to use tar because of files with holes if you know what
I
> >mean..
> 
> I dont, please explain.
> 
> Cheers,
> Menno
> 
> 
> 
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